三、听录音,根据对话内容和所给问题,选择正确的答案。(听三遍)(10分)()WhatdoWangBingandTimwanttodo?A.Gotothecinema.B.Goshopping.C.Gofishing.()Who'sWangBing'se-friend?A.Tim.B.R
三、 听录音,根据对话内容和所给问题,选择正确的答案。(听三遍) (10分)
() What do Wang Bing and Tim want to do?
A. Go to the cinema. B. Go shopping. C. Go fishing.
() Who's Wang Bing's e-friend?
A. Tim. B. Roy. C. Peter.
() How old is he?
A. Ten. B. Eleven. C. Twelve.
() Can Roy speak English?
A. No he can't. B. Yes he can. C. Sorry I don't know.
() Does he often play basketball after school?
A. Sorry I don't know. B. No he doesn’t. C. Yes he does.
例16设A和B都是n阶矩阵,矩阵C=A00B,则C*=(A)|A|A*0.(B)|B|B*0.0| 2020-05-14 …
A= (2 0 0) B=(1 0 0)(0 a 2) (0 2 0)(0 2 3) (0 0 b 2020-05-16 …
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汽车开进一个两侧山坡平行的峡谷,鸣笛后经0.5s听到左边山坡的回声,再经0.5s听到右边山坡的回声 2020-06-18 …
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①若a>0,b<0,则ab__0;若a<0,b<0,则ab__0;若a>0,b>0,则ab__0; 2020-07-30 …